/* format.c -- format a string */
#include <stdio.h>
#define MAX 20
char* s_gets(char* st, int n);

int main(void) {
  char first[MAX];
  char last[MAX];
  char format[2 * MAX + 10];
  double prize;

  puts("Enter your first name:");
  s_gets(first, MAX);
  puts("Enter your last name:");
  s_gets(last, MAX);
  puts("Enter your prize money:");
  scanf("%lf", &prize);
  sprintf(format, "%s, %-19s: $%6.2f\n", last, first, prize);
  puts(format);

  return 0;
}

char* s_gets(char* st, int n) {
  char* ret_val;
  int i = 0;

  ret_val = fgets(st, n, stdin);
  if (ret_val) {
    while (st[i] != '\n' && st[i] != '\0') i++;
    if (st[i] == '\n')
      st[i] = '\0';
    else
      while (getchar() != '\n') continue;
  }
  return ret_val;
}